Wall plate structure for drum type breaker mills



Oct, E99` 1954 s. n. HARTSHQRN 2,692,087

WALL PLATE STRUCTURE FOR DRUM TYPE BREAKER MILLS Filed 0t. l, 1951 Patented Oct. 19,'1954Y WALL PLATE STRUCTURE FOR DRUM TYPE BREAKER MILLS Stanley D. Hartshorn, Wayne,

Pa., assignor to Pennsylvania Crusher Company, Philadelphia, Pa., a corporation of New York Application October 1, 1951, Serial No. 249,202

3 Claims.

This invention relates to Bradford type breakers and more particularly to the structure of the drum. It is directed particularly to the mounting of the drum wall plates on the longitudinally extending rail beams.

In Bradford type breakers, such as described in the United States Patent No. 1,941,603 granted to Stanley D. Hartshorn on January 2, 1934, frangible material such as large pieces of coal is broken into smaller pieces by lifting the pieces on shelves mounted on the wall of the drum and dropping the pieces onto the drum wall. The Walls of the drum comprise heavy perforated screen plates fastened along their edges to rail beams extending longitudinally along the drum. The rail beams are connected at each end to heads or spiders to form a supporting frame structure. The drum is rotatably mounted at the ends so that the supporting structure and drum wall plates rotate about the longitudinal axis of the drum.

The object of this invention is to provide a drum structure of this type in which each drum wall plate is independently and separately removable from the supporting structure.

Another object of the invention is to provide drum wall plates with each .plate readily removable and replaceable Without disturbing the other plates.

Another object of the invention is to provide a breaker drum which is easily constructed and dismantled.

Other and further objects and advantages particularly in the structure of la composite beam support for the screen plates will be apparent from the following description taken in connection with the accompanying drawings in which Fig. 1 is a perspective View of a fragmentary portion of the drum wall structure;

Figs. 2, 3, and 4 are fragmentary sectional views of modified drum wall structures.

The drum wall plates IU are attached to the rail beams II by mounting plates I2. The drum wall plates I are of a rectangular shape with uniformly spaced holes I3 perforating the plate through which the properly sized pieces pass. The longitudinal edges 26a, 26h of the plate are solid for fastening the plate to the mounting plates i2. The drum wall plates are placed edgev to edge between the beams to form a continuous perforated wall from one end of the drum to the other and around the drum except for the portions covered by the mounting wall plates.

Each mounting plate has a central :portion I6 and outer fasteningflanges Ila and I'lb on each side of the central portion.

The drum wall plate IIJ is fastened along its edges to the anges Ila, Ilb by the fbolts 2l and the nuts 22, Flange I'Ia of one mounting plate is connected to one edge of the drum wall plate and flange Ilb of the next mounting plate is connected to the opposite edge of the same drum Wall plate. The mounting plates are rigidly secured to the rail beams by bolts I8 extending through the anges I4 of the rail beams and the central portions I6 and the nuts I 9 threaded on the bolts I8 and bearing against the bosses 23 on the flanges I4. A protective plate 20 is preferably placed on the inwardly facing surface of the mountingplate with the heads of the bolts I8 bearing against the plate 20.

The mounting plate I2 is preferably longer than the shelf 2l so that the bolts I8 may be removed Without disturbing the rigidity of the drum wall. The length of the mounting plate I2 is the same length at the drum wall plate and the bolts I8 may be removed without disturbing the drum wall plate connections or the position of the drum wall. The protective plate is preferably of the same length as the drum wall plate so that it is easily and readily removed.

The outer flanges I'Ia and I'Ib are preferably at an angle to the central portion and are bent towards the center of the drum. The mounting plates are fastened on each rail beam with the adjacent flanges that support the same drum Wall plates preferably in the same plane. With the adjacent flanges in the same plane the drum Wall Will be flat and not under any bending stress. In Fig.. 4 the mounting plate I2 is fiat with the ilanges Ila, IIb in the same plane as the central portion. The ends of the plate I0 are bent at an angle along the attaching edges to form flanges I Ela, IIlb. The anges Illa, I 0b preferably t on the mounting plates without bending the screen portion or placing it under stress.

The drum Wall plates II) may be bent along a longitudinal center line as shown in Fig. 3. The mounting plates I2 are flat with the flanges Ila and I'Ib even with the central portion I6. At the ends of the drum the plates abut against the spider sealing the open end of the drum except through the exit openings between the spiders. This form requires only one bend or crease as compared with the bending of each flange in the case of the nat wall plate.

The drum wall plates are removable from the supporting structure Without disturbing the attachment of the other drum Wall plates. Also the attachment of the drum wall plates is more easily made and not complicated by attaching two drum wall plates at the same time. The

mounting plates and drum wall plates form a unitary structure independent of the rail beams. The bolts IB may be removed from a particular rail and the drum wall plates on both sides of the mounting plate will hold the mounting plate in position. Thus the lifting shelves 2l may be removed Without unloosening the attachment of adjacent drum wall plates. With a single mounting plate l2 attached to two or more sets of drum wall plates a shelf may be attached or removed without disturbing the rigidity of the drum wall.

It is thus seen that the longitudinally extending rail beams ll are uniformly spaced and peripherally mounted at their ends on a pair of spaced. circular rim means forming; a unitary supporting structure. The circular vrim means may be the conventional type used in breaker mills of the rotating drum type and are used for supporting the rail beams on the end shafts which rotate about the central axis.

The drum wall plates l and the protective plates form an armoured plating protecting the mounting plates from the material being broken so that after a period of usage the mounting plates need not be replaced.

Although a specic embodiment has been described and illustrated in the foregoing description various modifications and changes may be made Without departing from the sco-pe of the invention.

I claim:

1. A breaker mill of the rotating drum type comprising a pair of spaced circular rim means, longitudinally extending rail beams parallel to a central axis and uniformly spaced peripherally from one another about said axis and secured to said rim means, mounting plates having a central portion secured to the inward facing surface of said rail beams and having flange portions extending on both sides of said central portion and in the same plane, drum Wall plates positioned between said rails and independently and separately mounted on the flanges to permit the removal and mounting of each drum wall plate `without disturbing the mounting of the mounting plates on said fixed rail beams.

2. A breaker mill as 'claimed in claim 1, Wherein said drum Wall plates have mounting .portions extending along opposite edges set at an angle to each other for attaching the drum wall plate to said mounting plates.

3. A breaker as claimed in claimf1, wherein said drum wall plate has mounting edge portions on opposite edges of said drum wall plate, said drum wall plate being intermediately bent between said edge portions to contiguous planar portions at an angle With each other and in the same plane as the edge portion associated therewith, so that planar portions of circumferential adjacent drum wall plates attached to the same mounting plate are in substantially the same plane.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,086,129 Borton et al. Feb. 3, 1914 1,427,031 Stepp Aug. 22, 1922 1,431,684 Rapp Oct. 10, 1922 1,563,173 Doerres Nov. 24, 1925 1,941,603 Hartshorn Jan. 2, 1934 1,948,504 Borton Feb. 27, 1934 2,012,602 Forrester Aug. 27 1935 2,189,711 Eigenbrot Feb. 6, 1940 2,204,835 Traylor June 18, 1940 2,555,171 Weston May 29, 1951 

